Expand and simplify each of the following

Pls help
They are in the picture

Ineed me i stuck and i don’t want to get it wrong

In the diagram of circle o, what is the measure of zabc?

Scenario: a rectangular plot of ground is 5 meters longer than it is wide. its area is 20,000 square meters. question: what equation will you find the dimensions? note: let w represent the width. options: w(w+5)=20,000 w^2=20,000+5 (w(w+5))/2=20,000 w+2(w+5)=20,000